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SP_connect

NAME

SP_connect - Connect an application to a daemon

SYNOPSIS

#include <sp.h>
int SP_connect( const char *spread_name, const char *private_name, int priority, int group_membership, mailbox *mbox, char *private_group);

DESCRIPTION

SP_connect is the initial call an application must make to establish a connection with a Spread daemon. All other spread calls must refer to a valid mbox returned by this function.

The spread_name is the name of the Spread daemon to connect to. It should be a string in one of the following forms:

4803

This will connect to the Spread daemon on the local machine running on port 4803. This form cannot be used to connect to a Windows95/NT machine.

4803@localhost

This will also connect to the Spread daemon on the local machine running on port 4803. This form can be used on Windows95/NT machines.

4803@host.domain.edu or 4803@128.220.221.99

This will connect to the machine identified by either domain name or IP address at the specified port.

The private_name is the name this connection would like to be known as. It must be unique on the machine running the spread daemon. The name can be of at most MAX_PRIVATE_NAME characters, with the same character restrictions as a group name (mainly it cannot contain the '#' character). If the application does not care what name it uses, it can pass in a NULL pointer into this field and the daemon will assign the connection a unique, random name.

The priority is a 0/1 flag for whether this connection will be a "Priority" connection or not. Currently this has no effect.

The group_membership is a boolean integer. If 1 then the application will receive group membership messages for this connection, if 0 then the application will not receive any membership change messages.

The mbox should be a pointer to a mailbox variable. After the SP_connect call returns this variable will hold the mbox for the connection.

The private_group should be a pointer to a string big enough to hold at least MAX_GROUP_NAME characters. After the Connect call returns it will contain the private group name of this connection. This group name can be used to send unicast messages to this connection and no one can join this special group.

RETURN VALUES

Returns ACCEPT_SESSION on success or one of the following errors ( < 0 ):

ILLEGAL_SPREAD

The spread_name given to connect to was illegal for some reason. Usually because it was a unix socket on Windows95/NT, an improper format for a host or an illegal port number

COULD_NOT_CONNECT

Lower level socket calls failed to allow a connection to the specified spread daemon right now.

CONNECTION_CLOSED

During communication to establish the connection errors occured and the setup could not be completed.

REJECT_VERSION

The daemon or library has a version mismatch.

REJECT_NO_NAME

This is a protocol error which should not occur if the connection request is sent correctly to the daemon. It means that the length of the user name was not sent (if no user name is provided a length of 0 must be sent).

REJECT_ILLEGAL_NAME

Name provided violated some requirement (length or used an illegal character)

REJECT_NOT_UNIQUE

Name provided is not unique on this daemon. Recommended response is to try again with a different name.

BUGS

None.

AUTHOR

Yair Amir <yairamir@cnds.jhu.edu>
Jonathan Stanton <jonathan@cnds.jhu.edu>
Commedia Project <commedia@cnds.jhu.edu>

SEE ALSO

libsp(3)